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Released Under R E P O R T For Department of State Growth Bridgewater Bridge Replacement – Design & Cost Estimate Review RTI under April 2016 Released RTI under Released TABLE OF CONTENTS Executive Summary ....................................................................................... 4 1 Introduction ........................................................................................... 5 2 Review Process ........................................................................................ 5 2.1 Engagement Proper ................................................................................. 5 2.2 Phase 1 Approach ................................................................................... 6 2.3 Functional Requirements .......................................................................... 6 3 Understanding the Current Design and Assessing Opportunities .......................... 7 3.1 Current Concept Design............................................................................ 7 3.2 Opportunities ........................................................................................ 7 3.3 Alternative Solutions ............................................................................... 8 4 Limitations & Constraints ........................................................................... 8 4.1 Geotechnical Considerations & Limitations .................................................... 8 4.2 Environmental Issues ...............................................................................RTI 9 Traffic Modeling ...................................................................................... 10 5.1 Network Traffic Volumes ......................................................................... 10 5.2 Modelled Options .................................................................................. 10 5.3 Traffic Assessment ................................................................................. 10 6 Shortlisted Alternative Options ................................................................. 12 6.1 The Low Cost Solution ............................................................................ 12 6.2 The Most Practical Solution ...................................................................... 12 6.3 Practical and Aesthetic Solution ................................................................ 13 6.4 East Derwent Highway Interchange .............................................................under 13 6.5 Temporary Works .................................................................................. 14 7 Cost Estimates ....................................................................................... 15 7.1 First Pass Estimate ................................................................................. 15 7.2 Refined Estimate ................................................................................... 16 8 Key Decisions & Risks .............................................................................. 19 9 Conclusions .......................................................................................... 20 Appendix A – Options Detailed Cost Estimate Appendix B – Option Drawings Appendix C - Traffic Modelling Report October 2015 AppendixReleased D - Traffic Modelling Report December 2015 Bridgewater Bridge – Design & Cost Estimate Review • April 2016 3 Executive Summary Replacement of the existing Bridgewater Bridge has been identified for many years, driven by reduced functionality and heightened maintenance costs. A number of studies have been undertaken to date inclusive of planning, property acquisition, community engagement and concept design. A cost estimate prepared on the concept design in 2012 determined a total outturn cost of P50 at $823M for construction commencing in 2019. A project cost of this magnitude is thought to be prohibitive in obtaining Federal Funding. JMG Engineers and Planners have been engaged by Department of State Growth to undertake a Design and Cost Estimate Review with a fresh set of eyes in order to determine a bridge crossing solution that is more cost feasible. JMG have utilised specialist sub consultants and contractors as part of this review process. Whilst there are a number of key decisions still to be made, noteworthy issues to be worked through and project risks to be managed, JMG consider that a bridge crossing at Bridgewater is achievable for a most likely construction cost in 2019 terms of between $246.16M and $503.2M, depending on the option selected. RTI under Released Bridgewater Bridge – Design & Cost Estimate Review • April 2016 4 1 Introduction The Bridgewater Bridge is an aged two-lane road and rail bridge that crosses the River Derwent between Granton on the western shore and Bridgewater on the eastern shore. The existing bridge has a lifting span to allow the passage of taller vessels than cannot fit under it in its lowered position. This has experienced significant issues in the recent past with inconvenience to the travelling public. The bridge has a height restriction, which requires high vehicles to detour via alternative routes and has a 60 km/hr speed limit that increases travel times. The causeway to the south of the existing bridge and the southern spans of the bridge have required significant maintenance works in the past to address settlement problems, these are expected to be ongoing issues. As a result of substantially reduced functionality, including service levels and bridge opening, and elevated maintenance costs, the Bridgewater Bridge has been identified for replacement for many years. The current concept design was completed in 2012 through significant studies and investigation and in 2019 terms, offers. The estimate ranged between a 2019 Total Outturn Cost of $823M P50 and $965M P90 (with escalation at 5%). It is highly unlikely that a bridge concept of this cost will attract the necessaryRTI federal funding required to grant its approval. Infrastructure Tasmania via Department of State Growth has engaged JMG Engineers & Planners (JMG) to review the concept design and cost estimate of the Bridgewater Bridge replacement with the aim of proposing a lower cost option than the current concept to the Australian Federal Government for consideration. This is a ‘fresh eyes’ approach where all reasonable options can be put ‘on the table’. This Design and Cost Estimate Review Report is the first milestone in the program and provides a description of the alternative solutions and associated costs estimated by JMG and their sub consultants. under 2 Review Process 2.1 Engagement Proper The broader review process for the full engagement includes the following three phases and milestones. • Phase 1 – Design and Cost Estimate Review (this phase) and Report (this report); • Phase 2 – Concept Design and Reporting of the preferred option; and • Phase 3 – Project Proposal Report for submission to Australian Federal Government. An essentialReleased part of the makeup of the Review Team has been the engagement of specialist sub consultants by JMG to provide a robust review process and solution identification. Midson Traffic has been engaged to undertake all traffic modeling required for the project and provide expert advice on the limitations or restrictions of the options on future traffic movements and levels of service. John Holland / Hazell Bros Group Joint Venture has been engaged to bring a constructors perspective to the project. Their work is specifically focused on bridge form and construction methodologies and cost estimation for the bridges and roadways. Bridgewater Bridge – Design & Cost Estimate Review • April 2016 5 2.2 Phase 1 Approach The Phase 1 work culminating in this Design and Cost Estimate Review Report has involved the following key tasks, with the primary objective of finding cost reductions: • Review of the currently proposed bridge structure; • Review of the currently proposed roads and interchanges; • Traffic modeling of future flows to revalidate service level requirements; • A challenge of any drivers and assumptions for the current design; • Risk and Opportunities workshop for the team to brainstorm and innovate solutions; • Identification of alternative solutions; • High-level appreciation of regulatory impacts associated with alternative solutions; • First-pass cost estimate of the alternative solutions; • Refined cost estimate of preferred solutions; and • Presentation to Department of State Growth. RTI The current concept design was developed from significant investigation and planning assessments that involved multi-criteria analysis for route, alignment, form and structure and road interchanges. Within the form and structure analysis, aesthetic merit and visual impact accounted for 30% of the decision. Our approach is quite different and coarser, fitting to a first-pass evaluation of potential alternative solutions with a fresh set of eyes. We have more generally considered (1) a low cost solution, (2) the most practical solution and (3) a practical solution with increased aesthetics. under The construction costs of the bridge will be the largest item in the cost schedule by far. For this reason, we have focused on finding alternatives for the bridge form and structure as a priority and allowing our choices in this area to affect the roads and interchanges (rather than the roads and interchanges affecting the bridge choices). In terms of a first-pass review to substantially reduce the most likely cost, we have also stayed focused on alternatives and items
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